// ==++==
// 
//   Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// ==--==
/*============================================================
**
** Class:  FieldToken
** 
** <OWNER>Microsoft</OWNER>
**
**
** Purpose: Represents a Field to the ILGenerator Class
**
** 
===========================================================*/
namespace System.Reflection.Emit {
    
    using System;
    using System.Reflection;
    using System.Security.Permissions;

    // The FieldToken class is an opaque representation of the Token returned
    // by the Metadata to represent the field.  FieldTokens are generated by 
    // Module.GetFieldToken().  There are no meaningful accessors on this class,
    // but it can be passed to ILGenerator which understands it's internals.
    [Serializable]
    [System.Runtime.InteropServices.ComVisible(true)]
    public struct FieldToken
    {
        public static readonly FieldToken Empty = new FieldToken();

        internal int m_fieldTok;
        internal Object m_class;
    
        // Creates an empty FieldToken.  A publicly visible constructor so that
        // it can be created on the stack.
        //public FieldToken() {
        //    m_fieldTok=0;
        //    m_attributes=0;
        //    m_class=null;
        //}
        // The actual constructor.  Sets the field, attributes and class
        // variables
    
        internal FieldToken (int field, Type fieldClass) {
            m_fieldTok=field;
            m_class = fieldClass;
        }
        
        public int Token {
            get { return m_fieldTok; }
        }
        
    
        // Generates the hash code for this field. 
        public override int GetHashCode()
        {
            return (m_fieldTok);
        }
    
        // Returns true if obj is an instance of FieldToken and is 
        // equal to this instance.
        public override bool Equals(Object obj)
        {
            if (obj is FieldToken)
                return Equals((FieldToken)obj);
            else
                return false;
        }

        public bool Equals(FieldToken obj)
        {
            return obj.m_fieldTok == m_fieldTok && obj.m_class == m_class;
        }
    
        public static bool operator ==(FieldToken a, FieldToken b)
        {
            return a.Equals(b);
        }
        
        public static bool operator !=(FieldToken a, FieldToken b)
        {
            return !(a == b);
        }

    }
}
